6111鋁合金固溶工藝多目標優化Multi-objective optimization of solution process of 6111 aluminum alloy

利用電子拉伸試驗機和維氏硬度計測試不同固溶處理后6111鋁合金板的抗拉強度、伸長率和維氏硬度，以固溶溫度和固溶時間為自變量，采用響應面模型對抗拉強度、伸長率和維氏硬度進行擬合，并對其進行單目標優化。結果表明：固溶處理工藝參數分別為(540.8 ℃, 31.8 min)、(496.6 ℃, 1.0 min)、(540.6 ℃, 32.0 min)時，抗拉強度、伸長率和維氏硬度達到最大，分別為299.12 MPa、24.95%和106.62；應用第二代非支配排序遺傳算法，對多個響應面模型進行優化求解，得到多目標優化模型的Pareto解集，從中可選擇使鋁合金板綜合力性能較好的解，進而獲得對應的固溶工藝參數。

The tensile strength, elongation and Vickers hardness of 6111 aluminum alloy samples after different solution treatment were measured by using the electronic tensile testing machine and the Vickers hardness tester. The data of tensile strength, elongation and Vickers hardness were fitted by response surface methodology, using solution temperature and solution time as independent variables. The optimization results of single-objective show that the tensile strength, elongation and Vickers hardness reach the maximum, when the solution treatment process parameters are (540.8 ℃, 31.8 min), (496.6 ℃, 1.0 min) and (540.6 ℃, 32.0 min), respectively, and the values of the tensile strength, elongation and Vickers hardness are 299.12 MPa, 24.95% and 106.62. Optimization of response surface models are solved by non-dominated sorting genetic algorithm Ⅱ (NSGA-Ⅱ), and the Pareto solutions of multi-objective model are obtained, within which the solutions of better performance of aluminum alloy can be selected, and the corresponding solution process parameters are gained simultaneously.

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